This is about Multiple Linear Regression.

We are interested in the relationship between - Risk of hospital-related infection in percent (Y) - Length of a patient's stay in the hospital in days (X1) - Number of nurses during patient stay (X2) - Region [NE, NC, S, W] where the patient was hospitalized 0(3) What does the following ANOVA table suggest? Analysis of Variance Table Model 1: inFect'ion_r\"isk ~ length_sta}ir + number_nur5es + region Model 2: infection_risk ~ 1ength_stay + number_nurses + region + number_nurses:region Res.of ass of sum of sq F Pr(>F) 1 194 198.?2 2 191 185.92 3 12.?9? 4.3822 0.00521? m" Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 ' ' Q There is a signicant interaction between length of stay and region Q The p-value for the F-test is signicant and we must therefore remove the interaction between length of stay and region Q The pvalue for the Ftest is signicant and we must therefore remove the interaction between number of nurses and region Q There is a signicant interaction between number of nurses and region